Hi. does anyone know what the problems produced by the limited range of the electromagnetic spectrum avaliable for communication purposes?

well there is only a limited amount of bandwidth we can use - eventually all the frequencies will be taken up.. we use radio -> infrared for communication and other electrical purposes eg mobiles, wireless internet, bluetooth etc.

All these devices need seperate frequencies(or wavelengths) so that we dont get our data all mixed up. We can only go to a certain point because then you get into infrared and then the visible part of the spectrum - these frequencies are all to abundant naturally (from the sun mainly) so they are useless in most applications. After visible is UV and then all the other dangerous and harmfull radiation.

So you can see its only a matter of time before we run out of frequencies..